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Патент USA US3095870

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July 2, 1963
F. .1. RANSOM ETAL
3,095,860
-
AI TORNEY'
" atent
r“ice
3095,86
Patented July 2., 1963
2
place when the pen is not in use. A liner 16 is ?tted
within the cap 12 and abuts the end of the feed section 20
to form an airtight seal over the point to prevent the
drying of the ink at the point. The exterior of the cap is
provided with a conventional clip 13.
A pair of shoulders 18 and 18’ are formed in the rear
ward portion of the barrel 10 to restrict the rearward
movement of a cartridge 50 which is received within the
3,095,860
CARTRIDGE FUUNTAIN PEN
Frederick J. Ransom and Charles K. Lovejoy, Atlanta,
Ga., assignors to Scripto, Inc., a corporation of Georgia
Filed May 1, 1962, Ser. No. 191,519
2 Claims. (Cl. nil-45.4)
This invention relates to writing instruments and more
particularly to an improved feed section for a cartridge
barrel 10. The shoulders are so formed that a long,
10 slender cartridge will abut the shoulder 18 While a short
?lled fountain pen.
The invention resides in the arrangement comprising a
and thicker cartridge will abut the shoulder 18'.
one-piece plastic feed section having a piercing tube
The feed section 20 is molded of plastic and has a for
ward bore 21 and a rear bore 22 of substantially the same
formed at its rearward end, with an internal bore that is
diameter. The forward bore 21 is designed to receive
provided with capillary ink feed grooves that extend for
ward from its rearward extremity, and a one-piece plastic 15 feed bar 30 while the rear bore 22 is adapted to receive
feed bar having capillary ink feed grooves formed along
the forward end of the cartridge 50. Within the rear
one surface and extending throughout its length. The
bore 22 of the feed section 20 there is formed a piercing
tube member 23, having its rearward extremity formed on
rearward portion of the feed bar has a tail section that is
partially disposed within the forward portion of internal
a bias so as to form an edge which is capable of punctur
bore of the piercing tube so that a portion of the capillary 20 ing the closure membrane of the ink cartridge 50 and
provide access to the ?uid contents of said cartridge 51)
feed grooves formed in the piercing tube run for a short
distance adjacent the capillary ink feed grooves formed on
through the central bore 24 of the piercing tube member
the feed bar. By this arrangement the ink-air transfer is
23.
regulated from a point within the piercing tube that is
Within the piercing tube member 23 there are longi
positioned in the ink cartridge.
25
tudinally extending, integrally formed capillary ink feed
grooves 25 and 25’. These extend throughout the bore
24 of the piercing tube member 23.
equal volume of ink from the reservoir to the feed bar,
Along the length of the upper surface of the feed bar
has been controlled by the aperture formed at the rear of
30 complementary to the ink feed grooves 25 and 25' of
the nib slit. This arrangement made available a puddle 30 piercing tube member 23, a pair of capillary ink feed
of ink that resided between the nib aperture, or heart of
grooves 31 and 31' are formed. At the end of the feed
the pen and the end of the feed bar. In such prior art
bar 30 there is a reduced diameter tail section 32 of gen
arrangements, air entered the'closed system as small bub
erally semi-cylindrical shape which is ?tted within the
bles and would frequently vary the supply of ink that was
forward portion of the bore 24 of the piercing tube mem
forward of the heart of the pen and available for writing
ber 23.
which resulted in a variation in the intensity of the Written
It will be noted that the forward portion of the feed bar
30 is provided with conventional over?ow chambers 33;
line.
In the arrangement of the present application control of
also a conventional point or nib 34 is mounted on the feed
the counter-?ow of air into the reservoir and ink to the
bar 30 and held in contiguous relationship by a frictional
point is shifted rearwardly to within the piercing tube 40 ?t within the forward bore 21. The feed bar 30 is
where the feed bar and piercing tube capillary ink feed
aligned within forward bore 21 of feed section 20 by key
grooves extend in parallel adjacent relation.
slot arrangement 36.
The capillary ink feed grooves are narrower and deeper
The ‘dimensions of the capillary ink feed grooves 31
at the point end and the path for the ingress of air be
and 31’ of feed bar 30 have a Width of .008" while the
comes progressiveiy larger toward the reservoir moving 45 depth varies from .016” at the tail section 32 assembled
through the following three sections, namely; the feed bar
within piercing tube 23 to .025" in the feed bar proper.
proper, the section of the piercing tube where the capillary
The ink feed grooves 25 and 25' of the piercing tube 23
In the past, the entry of air into a closed reservoir sys
tem of a fountain pen which results in a transfer of an
ink feed grooves are adjacently arranged, and the rear
have a Width and depth of .010".
portion of the piercing tube.
the capillarity increases toward the point as the width of
These and other advantages of the present invention
become apparent from the following description taken in
the grooves narrow and the ink capacity is increased as
It can been seen that
the depth of the grooves is increased.
It will also be noted that above the ink feed grooves 31
FIG. 1 is a side elevation in partial cross section of the
and 31' of the feed bar 30 there is an air channel 35'
fountain pen embodying our present invention;
having a depth of .015" and a width of .041” which uni
FIG. 2 is an enlarged longitudinal cross sectional view 55 formly extends back to where the tail section enters the
showing the feed bar and feed section arrangement;
bore 24 of the piercing tube member 23. The air ingress
FIG. 3 is an enlarged transverse cross section taken
space is progressively enlarged moving from the air chan
along line 3-3 of FIG. 2;
nel 35 of feed bar 30 to the portion where tail 32 is ?tted
FIG. 4 is an enlarged, transverse cross section taken
within piercing tube 23, and then to the rear portion of
60 bore 24 of piercing tube 23 to facilitate the entry of air
along line 4—é of FIG. 2;
FIG. 5 is a top plan view of the feed bar removed from
into the closed system.
It will thus be seen that the present invention provides
the feed section, and;
1G. 6 is an enlarged perspective view showing the
an air-ink counter-?ow system having an enlargement of
rearward extremity of the piercing element shown in
area for the entry of air into the cartridge reservoir from
65 the forward portion toward the rear portion of the feed
FIG. 2.
Referring now more particularly to the drawing and to
bar and feed section arrangement, while on the other hand
that embodiment here chosen by way of illustration, the
providing a narrowing of ink feed grooves for increased
device shown in FIG. 1 includes a barrel 10 threadably
capillary action, and a deepening of ink feed grooves for
engaged to the feed section generally denoted as 20. A
increased ink storage, from the rear portion toward the
70
point.
cap 12 is arranged to be placed over the feed section 20
frictionally engaging the ring 11 for holding the cap in
Such an arrangement provides a free counter-?ow sys
conjunction with the accompanying drawings, in which:
3,095,860
’
3
tern. The control of the counter-?ow is located Where
the tail section 32 of the feed bar 30 is ?tted into piercing
4
piercing means having an area greater than said air
channel of said feed bar to facilitate ingress of air within
tube 23. The adjacent, parallel, coextensive overlapping
the closed system, the air-ink counter-?ow metering action
relation of the grooves 31 and 31’ in the tail section 32
with the grooves 25 and 25' in the piercing member 23
provides a sensitive metering control ‘adjacent the closed
reservoir.
The ink ?ow toward the point involves the lateral
transfer from one capillary ink feed groove 25 or 25'
to an adjacent capillary ink feed groove 31 or 31' which l0
being controlled by theoverlapping arrangement of said
?rst and second plurality of ink feed grooves.
2. In a cartridge fountain pen having a barrel, a feed
section at one end of said barrel and in axial alignment
therewith, a piercing member having a bore therethrough
carried by said feed section, said piercing member being
so disposed as to pierce an ink cartridge when carried
accomplishes the controlled metering of the fluid.
within said barrel, a feed bar removably carried by said
It will thus be seen that the present invention provides
feed section, a point disposed on said feed bar, said point
a simple, ei?cient and effective cartridge fountain pen
having a body with nibs at the forward end of said body,
in which the ink will ?ow freely when required in use but
an axial slit in said nibs terminating at an aperture in said
will not ?ood. The smooth, replacement interchange of 15 body, said feed bar and said point being axially aligned
air and ink eliminates frothing which will cause a varia
and contiguous with each other, the combination there
tion in line density; therefore, the pen of the present in- , with of a tail piece on the rearward end of said feed bar,
vention produces a line of uniform density whether ‘the
said tail piece being adapted to be received within the
pen be moved fast or slow during writing.
‘
forward portion of the bore formed in said piercing mem
It will, of course, be understood that the device here 20 her, an ink feed groove in said feed bar extending from
presented is by way of illustration only and is meant to
its forward end to the extremity of said tail piece, an air
be in no way restrictive, therefore, numerous changes
channel in said ‘feed .b-ar parallel to and overlying said ink
and modi?cations may be made, and the full use of
groove, said air groove extending from substantially the
equivalents resorted to, without departing from the spirit
tip of said feed bar to the extremity of said tail piece, a
or scope of the invention as outlined in the appended 25 complementary ink groove in said bore of said piercing
claims.
.
'
.
member, said complementary ink groove being aligned
with and adjacent to said feed bar ink groove, and par
1. In a cartridge fountain pen having a barrel, a feed
tially overlapping a portion of said feed bar ink groove
section at the forward end of said barrel and in axial
such that ink must be transferred laterally from said
alignment therewith, piercing means having a bore there 30 complementary ink groove to said feed bar ink groove, a
We claim:
,
in carried by said feed section, said piercing means being
complementary ai-r channel in said bore of said piercing
so disposed to pierce an ink cartridge when carried within
said barrel, a feed bar carried by said feed section, and
a point mounted axially contiguous with said feed bar, the
combination therewith of a ?rst plurality of ink feed 35
with and adjacent to said feed bar air channel and par
' grooves formed on the upper surface of said feed bar
extending rearwardly the full length of said feed bar and
adapted to conduct ink by capillary action, an air channel
overlying said feed grooves and adapted to allow air to
enter the reservoir, 2' second plurality of ink feed grooves
formed Within the bore of said piercing means, said sec
ond plurality of ink feed grooves extending for a portion
member, said complementary air channel being aligned
tially overlapping said feed bar, the complementary air
channel of said piercingmember being of greater area
than the air channel of said feed bar to facilitate ingress
of air within the closed reservoir system, the capillarity
and ink storage capacity of said feed .bar ink groove
being greater than said piercing tube ink feed groove,
the air-ink counter-?ow being controlled by the metering
action effected by the overlapping arrangement of said
ink feed grooves.
of their length in‘ adjacent, parallel, overlapping relation
ship with a portion of the length of said'?rst plurality
of ink feed grooves, the arrangement being such that ink
from said ink cartridge is conducted through one of said
second plurality of ink feed grooves in said piercing
References Cited in the file of this patent
UNITED STATES PATENTS
2,881,737
2,935,968
Young ______________ __ Apr. 14, 1959
Morse et al. __________ __ May 10, 1960
?rst plurality of grooves for feeding to'the point, the
capillarity and ink storage capacity of said ?rst plurality
of ink feed grooves being greater than said second plu
‘ 2,964,012
Kahn et al. __________ __ Dec. 13, 1960
rality of said ink feed grooves, and said bore of said
v878,117
means, and is transferred laterally to enter one of said
’
FOREIGN PATENTS
Great Britain _________ __ Sept. 27, 1961
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